I am trying to write to SCL and SDA pins of the board.
I am using a couple of MCP23017 linked to these 2 pins (also with common ground). This program I am using is working fine with Arduino UNO. But here with Tiny I get these 2 big errors:

email me at teodoric8@yahoo.com if you know how to resolve this problem. Thank you.
Here is the entire code I used:

I still have win7 now in 2022. And I encounter a slight bug when I installed the 2.0a4 driver in the beginning. The driver installation freezed. After shutting down the entire installation (from my Process Explorer) and re-instal the 2.0a4 driver again, it managed to finalize the installation. I did everything on this page that is recommended to boot up and run the first program and it worked for me. It sucks I must unplug and re-plug the usb cord while programming it. In a word, it works for me.